DemographicsInnisplain is approximately 22.89 square kilometres. In 2016 the population of Innisplain was 85. The population is 64% male and 36% female. On average the monthly mortgage repayments in Innisplain are $1400 to $1799. The most common weekly income bracket is $650 to $799 per week. Weekly rents in the area are on average $100 to $149.